warm
温 centers on a gentle, comfortable heat: something warm in temperature, feeling, or atmosphere. The core idea is mild warmth rather than intense heat.
温 combines 氵 (water) with 昷, which likely contributes both sound and the idea of warmth. The right side 昷 is thought to represent a container (皿) with something warm (日) inside, suggesting heated water.
Water 氵 beside a warm container 昷: imagine a bowl of warm water with the sun shining on it, making it comfortably warm.
For オン, picture turning on a warm bath: on -> オン, and the water becomes warm.
hot spring
(air) temperature
temperature
warm; mild; temperate
to warm (up); to heat (up)
body temperature
high temperature
low temperature
greenhouse; hothouse; conservatory; glasshouse
preservation; retainment; keeping
to warm oneself; to sun oneself; to warm up; to get warm
warmth
water temperature
lukewarm; tepid
retaining warmth; keeping heat in; heat insulation
gentle; mild-mannered
hotbed; breeding ground
temperate zone
mild (climate); temperate; clement; pleasant; agreeable
(clinical) thermometer
global warming
natural hot spring
thermometer